staging: comedi: addi_common.h: remove 'ui_AiDataLength' from private data

This member of the private data is a copy of the s->async->prealloc_bufsz.
Use that instead.
Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/comedi/drivers/addi-data/addi_common.h

@@ -123,7 +123,6 @@ struct addi_private {
 	unsigned int ui_AiNbrofChannels;	/*  how many channels is measured */
 	unsigned int ui_AiChannelList[32];	/*  actual chanlist */
 	unsigned int ui_AiReadData[32];
-	unsigned int ui_AiDataLength;
 	unsigned int ui_AiNbrofScans;	/*  number of scans to do */
 	unsigned short us_UseDma;	/*  To use Dma or not */
 	unsigned char b_DmaDoubleBuffer;	/*  we can use double buffering */

drivers/staging/comedi/drivers/addi-data/hwdrv_apci3120.c

@@ -1152,10 +1152,10 @@ static int apci3120_cyclic_ai(int mode,
 					dmalen1 = 4;
 			}
 		} else {	/*  isn't output buff smaller that our DMA buff? */
-			if (dmalen0 > (devpriv->ui_AiDataLength))
-				dmalen0 = devpriv->ui_AiDataLength;
-			if (dmalen1 > (devpriv->ui_AiDataLength))
-				dmalen1 = devpriv->ui_AiDataLength;
+			if (dmalen0 > s->async->prealloc_bufsz)
+				dmalen0 = s->async->prealloc_bufsz;
+			if (dmalen1 > s->async->prealloc_bufsz)
+				dmalen1 = s->async->prealloc_bufsz;
 		}
 		devpriv->ui_DmaBufferUsesize[0] = dmalen0;
 		devpriv->ui_DmaBufferUsesize[1] = dmalen1;
@@ -1339,9 +1339,6 @@ static int apci3120_ai_cmd(struct comedi_device *dev,
 	/* loading private structure with cmd structure inputs */
 	devpriv->ui_AiNbrofChannels = cmd->chanlist_len;
 
-	/* UPDATE-0.7.57->0.7.68devpriv->ui_AiDataLength=s->async->data_len; */
-	devpriv->ui_AiDataLength = s->async->prealloc_bufsz;
-
 	if (cmd->stop_src == TRIG_COUNT)
 		devpriv->ui_AiNbrofScans = cmd->stop_arg;
 	else